RT 1200 Trim/Size die issues

[cworks]

Following typical instructions:

1) Screw the die down until it makes contact with the shell plate. Unscrew 1/2 turn. The first picture is what I get. You can barley notice but about 3/4 of the way down the neck you can see a bulge.

2) Screw die down until the obvious bulge is at the bottom of the neck

3) I Now insert the brass into my JP Enterprise case gauge. The brass is about .002 high

4) My thought process is that the brass is a little to big and the die needs to be brought down just a hair. I screw the die down 1/16 to an 1/8th of a turn and this is what happens.

What exactly is happening? Should I just be happy with the brass being .002 high?

Edited July 8, 2013 by cworks

[StealthyBlagga]

The brass protruding that far probably won't chamber and fire, so you have to get to the bottom of this.

I size/trim .223 brass, and my 1200 die is screwed down until it touches the shellplate, then DOWN another 1/8 turn (i.e. the press cams over center). I also pre-size in station 1 using an RCBS neck sizer, so that may be helping. Also, I make sure the shellplate is fully populated with brass before I start checking the dimensions of the sized/trimmed brass (makes for more consistent operation).

Edited July 7, 2013 by StealthyBlagga

[Boxerglocker]

Are you using a Dillon case gauge to set up the trim die to get the correct set back? What lube are you using?

[Scott Steele]

Did "Hard Time" cover this in the JP gas gun basics video?

[cworks]

The brass protruding that far probably won't chamber and fire, so you have to get to the bottom of this.

I size/trim .223 brass, and my 1200 die is screwed down until it touches the shellplate, then DOWN another 1/8 turn (i.e. the press cams over center). I also pre-size in station 1 using an RCBS neck sizer, so that may be helping. Also, I make sure the shellplate is fully populated with brass before I start checking the dimensions of the sized/trimmed brass (makes for more consistent operation).

Any thoughts on why screwing the die further down is causing to brass to fail the JP case gage? When I have my Dillon Sizing/Depriming die screwed in to far the brass sits to low in the case gage. I am using a Dillon universal Depriming die in station 1 and RT 1200 in station 3.

[cworks]

looks like running the Dillon Sizing/Depriming die first took care of my issues